How do I change a Windows 7 IRQ interrupt assignment?


A

a

I am using an XFX video card based on the ATI 5450 chip. I like to use
the 1280x800 resolution. This works fine in Windows XP with my
Samsung T220 monitor.

But with Windows 7 it does not display properly. The monitor is
getting a signal which says there are 960 vertical lines rather than
the 800 vertical lines Windows is set for. So the image is compressed
vertically and there's black space at the top and bottom since there
are only 800 lines in the image and the monitor thinks there should be
960. This is with ATI's latest 10.3 drivers.

In XP the display adapter uses interrupt 16 but with W7 is uses some
sort of simulated interrupt with a strange long number.

Is there a way I can change W7 to use interrupt 16 for the video card?

Also I remember that in XP you could press F5 during installation and
get an option to install without interrupt sharing. Is there
something similar in W7 and should I try a re-install?

THANKS IN ADVANCE.
 
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J

johnbee

I am using an XFX video card based on the ATI 5450 chip. I like to use
the 1280x800 resolution. This works fine in Windows XP with my
Samsung T220 monitor.

But with Windows 7 it does not display properly. The monitor is
getting a signal which says there are 960 vertical lines rather than
the 800 vertical lines Windows is set for. So the image is compressed
vertically and there's black space at the top and bottom since there
are only 800 lines in the image and the monitor thinks there should be
960. This is with ATI's latest 10.3 drivers.

In XP the display adapter uses interrupt 16 but with W7 is uses some
sort of simulated interrupt with a strange long number.

Is there a way I can change W7 to use interrupt 16 for the video card?

Also I remember that in XP you could press F5 during installation and
get an option to install without interrupt sharing. Is there
something similar in W7 and should I try a re-install?

THANKS IN ADVANCE.
I will say something in case nobody knows the exact answers to what you ask.
The Windows 7 documentation, help system, and all the books I have read
(well, both of them, The Windows Bible and the Administrator's Pocket
Consultant) are very adamant that you should use the standard display
settings for your monitor.

They have done something to the monitor functions in Windows 7 because much
software does not work even if one just chooses to up the screen text size
by clicking on preferences. So that, coupled with the urging to use the
monitor's native settings seems to me to mean that they know it does not
work as flexibly as previous versions. (I know nothing of Vista as I missed
it out).

Just in case you have not done this, type msinfo32 into the search programs
and files box on the Start menu. That will give a list of IRQ numbers -
mine are all the usual little ones except for three labelled hub.
 
C

c_atiel

This is not an IRQ problem.
It may seem silly but make sure the cable to your monitor is properly seated
and the correct monitor/monitor model is identified by both the Catalyst
Control Center and Vista SP3.
There are ways to change the IRQ but if you really understood what that
meant you would already know how to do it. Changing the IRQ will not solve
your issue.
The native resolution reported on a search of Samsung T220 is given as 1680
x 1050.
If you run it at a lower resolution image quality falls off markedly. The
image on most LCD panels at lower resolutions can be blurred and nauseating
but its your choice. These are not plasma HDTVs but cheapo 6 bit dithered
consumer LCDs.
The ATI Catalyst control center should give 1280 x 800 as a choice (mine
does) as should the Vista SP3 display control for a panel of that height and
width ratio.
If you are not seeing these resolutions offered then something is wrong with
the way your monitor is identified by the video card.
Some poorly written data base front ends for business will not run at the
higher resolutions of modern LCDs because data columns and rows will not
align properly.
Apart from that I cannot imagine why you would want to run an LCD at a lower
than native resolution--you can adjust font and Icon sizes to suit your
taste and myopia.
 
G

Gene E. Bloch

I am using an XFX video card based on the ATI 5450 chip. I like to use
the 1280x800 resolution. This works fine in Windows XP with my
Samsung T220 monitor.

But with Windows 7 it does not display properly. The monitor is
getting a signal which says there are 960 vertical lines rather than
the 800 vertical lines Windows is set for. So the image is compressed
vertically and there's black space at the top and bottom since there
are only 800 lines in the image and the monitor thinks there should be
960. This is with ATI's latest 10.3 drivers.

In XP the display adapter uses interrupt 16 but with W7 is uses some
sort of simulated interrupt with a strange long number.

Is there a way I can change W7 to use interrupt 16 for the video card?

Also I remember that in XP you could press F5 during installation and
get an option to install without interrupt sharing. Is there
something similar in W7 and should I try a re-install?

THANKS IN ADVANCE.
This is not the native resolution of 1680 x 1050, so something's got to
give.

Either the video card expands the picture to fill the screen - which can
look pretty crappy - or it puts out one pixel per actual screen pixel,
which makes the image not fill the screen.

There's possibly a setting in the video driver or even in the monitor's
on-board setup to make this choice (I've owned monitors where the selection
is in the monitor's on-board setup).
 
A

a

I will say something in case nobody knows the exact answers to what you ask.
The Windows 7 documentation, help system, and all the books I have read
(well, both of them, The Windows Bible and the Administrator's Pocket
Consultant) are very adamant that you should use the standard display
settings for your monitor.

They have done something to the monitor functions in Windows 7 because much
software does not work even if one just chooses to up the screen text size
by clicking on preferences. So that, coupled with the urging to use the
monitor's native settings seems to me to mean that they know it does not
work as flexibly as previous versions. (I know nothing of Vista as I missed
it out).

Just in case you have not done this, type msinfo32 into the search programs
and files box on the Start menu. That will give a list of IRQ numbers -
mine are all the usual little ones except for three labelled hub.

Thanks for your help. I'll have to live with the 1680x1050 resolution
until ATI or somebody fixes this. I set W7 to used the Medium screen
sizing option so most things are resized bigger but I see some stuff
just doesn't resize and work properly. My interrupt table says the
video card is using IRQ 4294967294 which sounds like some sort of
simulated interrupt. I seem to remember that when XP first came out I
had similar problems with an older ATI card and was only able to solve
them by installing XP for a generic computer using the F5 option. I
don't remember if I did this the last time I reinstalled XP or if ATI
fixed the drivers. I've sent a report to ATI about this so maybe
they'll fix it soon. Thanks again.
 
S

SC Tom

Thanks for your help. I'll have to live with the 1680x1050 resolution
until ATI or somebody fixes this. I set W7 to used the Medium screen
sizing option so most things are resized bigger but I see some stuff
just doesn't resize and work properly. My interrupt table says the
video card is using IRQ 4294967294 which sounds like some sort of
simulated interrupt. I seem to remember that when XP first came out I
had similar problems with an older ATI card and was only able to solve
them by installing XP for a generic computer using the F5 option. I
don't remember if I did this the last time I reinstalled XP or if ATI
fixed the drivers. I've sent a report to ATI about this so maybe
they'll fix it soon. Thanks again.
The IRQ on my notebook with the ATI Mobility Radeon HD2600 PCIe is the same
as yours, with my Intel wireless adapter being one less. Things that make
you go "Huh!"
One thing I found in your manual is that 1280x800 is not a native preset for
that monitor, so that may be part of the problem. One thing you might try if
you have the hardware is to change the way you're connected. For example, if
you currently have it connected via the DVI port, try connecting it to the
D-sub port. If you're video card doesn't have a D-sub out, you could try a
DVI-to-DSUB adaptor.
Since there is no monitor driver for Win7, you can right-click the setup
file you have (which is probably for Vista?) and select Properties,
Compatibility, check the box next to "Run this program in compatibility mode
for:" and pick Vista Service Pack 2. Win7 should then show the monitor as
what it is. This link is for the driver through Vista:
http://www.samsung.com/us/support/detail/supportPrdDetail.do?menu=SP01&prd_mdl_cd=&prd_mdl_name=T220HD&prd_ia_sub_class_cd=P
They haven't released one for Win7 and probably won't if they haven't by
now.
 
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S

SC Tom

SC Tom said:
The IRQ on my notebook with the ATI Mobility Radeon HD2600 PCIe is the
same as yours, with my Intel wireless adapter being one less. Things that
make you go "Huh!"
One thing I found in your manual is that 1280x800 is not a native preset
for that monitor, so that may be part of the problem. One thing you might
try if you have the hardware is to change the way you're connected. For
example, if you currently have it connected via the DVI port, try
connecting it to the D-sub port. If you're video card doesn't have a D-sub
out, you could try a DVI-to-DSUB adaptor.
Since there is no monitor driver for Win7, you can right-click the setup
file you have (which is probably for Vista?) and select Properties,
Compatibility, check the box next to "Run this program in compatibility
mode for:" and pick Vista Service Pack 2. Win7 should then show the
monitor as what it is. This link is for the driver through Vista:
http://www.samsung.com/us/support/detail/supportPrdDetail.do?menu=SP01&prd_mdl_cd=&prd_mdl_name=T220HD&prd_ia_sub_class_cd=P
They haven't released one for Win7 and probably won't if they haven't by
now.
That should be "your video card" instead of "you're" :)
 
A

a

The IRQ on my notebook with the ATI Mobility Radeon HD2600 PCIe is the same
as yours, with my Intel wireless adapter being one less. Things that make
you go "Huh!"
One thing I found in your manual is that 1280x800 is not a native preset for
that monitor, so that may be part of the problem. One thing you might try if
you have the hardware is to change the way you're connected. For example, if
you currently have it connected via the DVI port, try connecting it to the
D-sub port. If you're video card doesn't have a D-sub out, you could try a
DVI-to-DSUB adaptor.
Since there is no monitor driver for Win7, you can right-click the setup
file you have (which is probably for Vista?) and select Properties,
Compatibility, check the box next to "Run this program in compatibility mode
for:" and pick Vista Service Pack 2. Win7 should then show the monitor as
what it is. This link is for the driver through Vista:
http://www.samsung.com/us/support/detail/supportPrdDetail.do?menu=SP01&prd_mdl_cd=&prd_mdl_name=T220HD&prd_ia_sub_class_cd=P
They haven't released one for Win7 and probably won't if they haven't by
now.

I'll probably have to wait until the ATI W7 drivers mature. The whole
point is that this works fine with XP.
 
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S

SC Tom

I'll probably have to wait until the ATI W7 drivers mature. The whole
point is that this works fine with XP.
And part of the reason it worked with XP is that the proper monitor driver
was installed. Unfortunately, there probably won't be one forthcoming from
Samsung.
 

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