16 bit depth causes green/blue tinted screen and extreme darkness.
fix is here:(change line number from 450 to 377 for the current ati in archlinux)

Boyan Anastasov 2010-01-15 19:28:39 EST
There is a difference in the driver for 16bit depth when setting gamma.
I've disabled it and now the picture is ok.


xf86-video-ati-20091221/src/radeon_crtc.c, at line 450:

static void
radeon_crtc_gamma_set(xf86CrtcPtr crtc, uint16_t *red, uint16_t *green,
uint16_t *blue, int size)
{
RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;
ScrnInfoPtr pScrn = crtc->scrn;
int i, j;

if (0/*pScrn->depth == 16*/) {
for (i = 0; i < 64; i++) {
if (i <= 31) {
for (j = 0; j < 8; j++) {
radeon_crtc->lut_r[i * 8 + j] = red[i] >> 6;
radeon_crtc->lut_b[i * 8 + j] = blue[i] >> 6;
}
}

for (j = 0; j < 4; j++) {
radeon_crtc->lut_g[i * 4 + j] = green[i] >> 6;
}
}
} else {
for (i = 0; i < 256; i++) {
radeon_crtc->lut_r[i] = red[i] >> 6;
radeon_crtc->lut_g[i] = green[i] >> 6;
radeon_crtc->lut_b[i] = blue[i] >> 6;
}
}

radeon_crtc_load_lut(crtc);
}