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Reduced Resolution on SIS730 chipset

Trish's Escape from Hardware Hell Help Board » Hardware » Video Related Problems » Reduced Resolution on SIS730 chipset « Previous Next »

Author Message
Stephan Kühn
Posted on Wednesday, January 28, 2004 - 4:23 pm:   

Dear all,

after having bought a new 1280x1024 TFT display, my onboard SIS graphics lost previously available resolutions 1280x1024 and 1600x1200. It only supports 1024x768, which is a pain, as I just bought the higher resolution TFT.

I would deeply appreciate your help!

OS: Win2000 Advanced Server SP4

Elitegroup K7SOM+ with Athlon XP 1700+ running at 133MHz. 1 GB of PC266 memory. Version Motherboard unknown, not printed on board itself.

AMI BIOS 10/29/2002S
Video BIOS 12/13/20

Video Adapter Device: SiS 650_651_M650_M652_740
BIOS String: 1.05.00
Chip Type: SiS 740 Rev 00a
DAC Type: Internal
Installed Drivers SiSGRV (
Memory Size: 64 MB

The TFT display has been working initially at 1280x1024, but I installed a DVD-R/RW+ at the same time. My raid array decided to report a lost device due to SMART alerts, and I updated the driver of my Ultra-ATA/133 Raid array (SIL0680).

I believe the above to be just coincidents.

While updating the driver for the RAID array, I also updated the Graphics Driver from the Windows Update Page (will not do again!). The version I updated to was SiS 650_651_M650_M652_740, version

After this, the display adapter just supports 1024x768 resolution.

I have tried to deinstall the driver, reboot the machine, and install any of the drivers from SIS download support page. I've tried 650 v2.21, 650 v2.19. The problem remains unchanged. The only improvement (or change, rather) was that once I was able to set resolution to 1280x768, but I lost that in the search of 1280x1024 and was not able to recreate the same configuration.

I have also contacted Elitegroup, who finally recommended on re-installing Windows 2000 from scratch, as they believe the problem to be caused by some settings in the registry which are not properly deleted when deinstalling the driver, but affecting previous versions of the driver nonetheless.

As this is a development machine with some tons of software installed, I would prefer to fix the problem without reinstalling Win.

Thanks in advance for your time and your recommendations.

Kindest Regards
Posted on Wednesday, January 28, 2004 - 4:38 pm:   

Try changing the adaptor driver to a standard pci type reboot the machine and load the driver you used to get the desired resolution previously.
Stephan Kühn
Posted on Wednesday, January 28, 2004 - 5:40 pm:   

Hello E.S.

Thanks for your answer

I am not sure what you mean by standard pci type.

I had uninstalled the SIS display driver completely, reverting back to W2K standard VGA driver.

I rebooted, and got 800x600 as was to be expected.

I then installed the original SIS driver: V2.19, but even after this the resolution was limited to 1024x768.

Kind Regards
Wayne Lewis
Posted on Wednesday, January 28, 2004 - 7:27 pm:   

Have you tried this SiS site?
Posted on Wednesday, January 28, 2004 - 10:41 pm:   

Standard PCI VGA is exactly what I meant, sorry for the confusion. The driver for the video might not be an issue but win2k's incessant inability to recognise the type of video monitor you are using. It has been a while since I poked around inside a Win2k server install so bear with me here. Try Powerstrip from to see if the desired setting can be achieved. Sometimes it takes third party software to diagnose a Windows problem.
Stephan Kühn
Posted on Thursday, January 29, 2004 - 6:12 am:   

Hi Wayne!

Thanks for your answer, I have downloaded mentioned drivers 650 v2.21, 650 v2.19 directly
from sis support web site.

Kind Regards
Stephan Kühn
Posted on Thursday, January 29, 2004 - 6:22 am:   

Hello E.S.

Thanks for the pointer to EnTech. But after installing PowerStrip I am still at a loss on what I should do now.

PowerStrip starts up fine, but I cannot change resolution to anything higher than 1024x768.

Any specific section in the help file of PowerStrip that would help me further.

I even tried to remove Windows restrictions for the resolutions on my display, but to no avail.

Thanks for your help
Posted on Thursday, January 29, 2004 - 9:22 am:   

Sorry man, I'm out of ideas other than what was recommended earlier of the format and reinstall. If the Entech utility can't get around it it's probably a registry entry thats changed.
Stephan Kühn
Posted on Thursday, January 29, 2004 - 10:55 am:   

Hello E.S.

Thanks again for your time. I just had a rather far fetched idea - I want to find out which registry settings this could be, as I really do not want to reinstall.

How about if I uninstall my display adapter, reverting back to the default VGA, and take a snapshot of the registry. Then I would install the SIS driver, take another snapshot of the registry, and would compare both snapshots.

By this, I would hope to identify in what sections of the registry the driver settings are located, and if I find a setting in this section which is present before and after the installation I might have identified the offending section.

Does this make sense to you?

Would anybody have some information relating to registry settings for display adapters, especially on registry settings that control the max. resolution of a display?

Kind Regards
Posted on Thursday, January 29, 2004 - 9:36 pm:   

There should actually be two registry settings. one for the video adaptor and one for the monitor.
Both could be affected by display drivers.
So a snapshot should at least be revealing enough to find what values get changed for each.

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