mobilenvidia Posted October 14, 2007 Report Share Posted October 14, 2007 Seeing ZZPULP fixed the BSOD go7950GTX problem, I felt jealous and fixed the other bug afflicting even more Dell users. For quite sometime now the WUXGA (1920x1200) desktop distortion problem after about a minute of use has been an issue for the 16x.xx drivers for some (and me). I've gone through the Dell INFs and found a fix for this issue. Working as we speak, 163.75 Vista x64 no longer has this issue for me. The fix has been added to 163.75 and 163.76 and will be included with future drivers. Those wanting to fix other modded INFs them selves need to edit the INF with a text editor. Look for this line: HKR,, LVDSReduceFreq, %REG_DWORD%, 0 Now just set the value to 1. reinstall driver and all will be well. This for go7950 GTX users will be like Xmas with 2 fixes :) [uPDATE] The above fix only applies to 16x.xx drivers. It does not work on 156.xx drivers :) If you are happy with a 156.xx driver and only issue is the desktop distortion then edit the INF with a text editor. look for this line: HKR,, PowerMizerEnable, %REG_DWORD%, 1 Change the 1 to a zero and reinstall, it will cure the Desktop distortion but there will be no Core/Memory clock speed reduction in 2D mode. (to save power) Best I can do for now. Could also do with some input whether this happens only on Dell's in this case the i9400/E1705 and only with WUXGA (1920x1200) [uPDATE II] The problem does go away with 156.66 after the screen powers down with Vista Power settings. Once resumed the GPU will go into low power mode and no more corruption even though before screen powerdown it was corrupted After about an hour, the corruption came back :P [uPDATE III] My friend debaucher has done some excellent work with this problem and has found a cure for those willing to flah their Dell based video BIOS's (there are unlocked BIOS's for a number of go7x00 GPU's) SUCCESS in figuring out what causes the problemI enabled the line HKR,, PerfLevelSrc, %REG_DWORD%, 0x3333 as you suggested and got the corruption. Then, this is what I did to fix it...... I noticed that the rivatuner monitor would show the core clock would become 0 (even thought it is acutally at 100) and the memory clock would become 110 upon 2D. The bios settings are default (on my card... 2500M) of core 100 mem 110. So, I played with these. I first set the core to 110 as well, when 2D hit, rivatuner monitor showed that 110core and 110 memory was set but corruption still occurred. So, I went for broke and tried 2D settings of 150core and 150memory. 2D hit at these settings and all is good (I am typing it with those settings now). So, now I have to find the 'sweet' spot as far as speed goes. ........ edit... from the graphical distortion.. it seems more a memory problem than a core so I tried 110core and 120memory and got corruption ......... edit.... tried 110core and 130 memory and no corruption. ......... edit ... tried 100core and 130 memory and got NO corruption SO.. it seems to be a memory issue (always wondered why the default memory speed was 110 when the core was only 100 ... ie why the extra 10mhz on the memory compared to the core) I no modded my vid firmware to have 110core and 130 memory and re-flased it so I dont have to worry about setting up a fresh 2D profile with software overclocking. Now.... why exactly this happens.... I don't know... especially when in XP this does not occur and powermizer works properly. I guess it could do with either vista aero gpu requirements, or the memory on my card needing a higher frequency to run, or a problem with vista and powermizer control or ???????????? Will do more testing.. .I am just stoked that 2D is working (in a way). D. Quote Link to comment Share on other sites More sharing options...
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