<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - no backlight after suspend to ram with modesetting Trinity [7400G]" href="https://bugs.freedesktop.org/show_bug.cgi?id=73882#c5">Comment # 5</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - no backlight after suspend to ram with modesetting Trinity [7400G]" href="https://bugs.freedesktop.org/show_bug.cgi?id=73882">bug 73882</a> from <a class="email" href="mailto:djtm@gmx.net" title="D <djtm@gmx.net>"> D</a> <pre>Updates: Taking back the last comment, works also with hibernation via pm-hibernate (Ubuntu 12.04). - Even hibernation only resumes with an active display when booting with kernel parameters nomodeset vga=0. Then I load radeon with modeset=1. (e.g. via modprobe.d) - freeze > /sys/power/state also does not work. - radeontool (git) finds some registers are different after resume: (after on top, before in second line) RADEON_CRTC_H_TOTAL_DISP 0001f478 | RADEON_CRTC_H_TOTAL_DISP e0003040 RADEON_CRTC_H_SYNC_STRT_WID 060f0001 | RADEON_CRTC_H_SYNC_STRT_WID 00000000 RADEON_CRTC_V_TOTAL_DISP 00000000 RADEON_CRTC_V_TOTAL_DISP 00000000 RADEON_CRTC_V_SYNC_STRT_WID aaaa5555 RADEON_CRTC_V_SYNC_STRT_WID aaaa5555 RADEON_CRTC2_H_TOTAL_DISP 0000000f | RADEON_CRTC2_H_TOTAL_DISP 0200000f RADEON_CRTC2_H_SYNC_STRT_WID 00003f3f | RADEON_CRTC2_H_SYNC_STRT_WID 00000000 RADEON_CRTC2_V_TOTAL_DISP 00000000 | RADEON_CRTC2_V_TOTAL_DISP 00000100 - radeontool light on/off never has any effect on my system. - avivotool finds that D1CRTC is Disabled after resume. - There is a warning in dmesg regarding brightness query: ACPI: No _BQC method, cannot determine initial brightness - The display is always turned off already during suspend, and simply never returns from there. Hibernation only works, because the BIOS turns the display back on. Without the radeon driver and kms active, as stated above, the quirks help the display of wake up again.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>