Hello Suresh. Thanks for responding.
I've done 4 successive boots with the boot parameters as shown below.
Each boot was basically: set correct parameters in grub -> login to KDE
-> reboot and check for artifacts.
1) (none) --> clean
2) vga=791 --> artifacts
3) vga=791 nopat --> clean
4) vga=791 video=vesafb:mtrr:3 --> artifacts
So the mtrr option did not help (if I passed it correctly; the double ":"
is somewhat non-intuitive). The kernel log also does not show any
difference I can see in the last boot, but I don't know if the mtrr option
is supposed to show up in any way.
From the kernel log for each boot:
1) x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Console: colour VGA+ 80x25
console [tty0] enabled
2) x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Console: colour dummy device 80x25
console [tty0] enabled
vesafb: framebuffer at 0x80000000, mapped to 0xffffc20000900000, using 3072k, total 7872k
vesafb: mode is 1024x768x16, linelength=2048, pages=4
vesafb: scrolling: redraw
vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0
Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
3) PAT support disabled
Console: colour dummy device 80x25
console [tty0] enabled
vesafb: framebuffer at 0x80000000, mapped to 0xffffc20000900000, using 3072k, total 7872k
vesafb: mode is 1024x768x16, linelength=2048, pages=4
vesafb: scrolling: redraw
vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0
Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
4) x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Console: colour dummy device 80x25
console [tty0] enabled
vesafb: framebuffer at 0x80000000, mapped to 0xffffc20000900000, using 3072k, total 7872k
vesafb: mode is 1024x768x16, linelength=2048, pages=4
vesafb: scrolling: redraw
vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0
Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
Hope that helps. If you need any additional information, please ask.
Cheers,
FJP
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