From: Krzysztof Helt Do not overwrite bits which contain memory type settings. It removes noise pixels ("snow") on Blade3D and 3DImage chips. Signed-off-by: Krzysztof Helt Signed-off-by: Andrew Morton --- drivers/video/tridentfb.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff -puN drivers/video/tridentfb.c~tridentfb-preserve-memory-type-settings drivers/video/tridentfb.c --- a/drivers/video/tridentfb.c~tridentfb-preserve-memory-type-settings +++ a/drivers/video/tridentfb.c @@ -1095,7 +1095,10 @@ static int tridentfb_set_par(struct fb_i vga_mm_wseq(par->io_virt, 4, 0x0E); /* memory mode enable bitmaps ?? */ /* divide clock by 2 if 32bpp chain4 mode display and CPU path */ - write3CE(par, MiscExtFunc, (bpp == 32) ? 0x1A : 0x12); + tmp = read3CE(par, MiscExtFunc) & 0xF0; + if (bpp == 32) + tmp |= 8; + write3CE(par, MiscExtFunc, tmp | 0x12); write3CE(par, 0x5, 0x40); /* no CGA compat, allow 256 col */ write3CE(par, 0x6, 0x05); /* graphics mode */ write3CE(par, 0x7, 0x0F); /* planes? */ _