https://bugs.freedesktop.org/show_bug.cgi?id=28901
Summary: ATI driver returns dim screen at color depth 16
Product: xorg
Version: 7.5
Platform: All
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
In xorg 7.0, the open source driver works fine at color depth 16. However,
after I upgraded to 7.5, using the same Driver settings, the screen will go
unreasonably dim.
As suggested in other forum (i.e.
https://bugzilla.redhat.com/show_bug.cgi?id=554967), I have to disable the
gamma set for color depth 16, as follows:
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;
}
}
...
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