<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - intel_backlight doesn't work with i915 Haswell" href="https://bugs.freedesktop.org/show_bug.cgi?id=92866#c7">Comment # 7</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - intel_backlight doesn't work with i915 Haswell" href="https://bugs.freedesktop.org/show_bug.cgi?id=92866">bug 92866</a> from <a class="email" href="mailto:holgerschurig@gmail.com" title="Holger Schurig <holgerschurig@gmail.com>"> Holger Schurig</a> <pre>@Jani, I attached 3 files which I made this way: root:~# history 1 dmesg -c >1.txt 2 vbetool dpms off 3 dmesg -c >2.txt 4 vbetool dpms on 5 dmesg -c >3.txt The funny thing: this time it worked. I did neither get the funny "Unclaimed register before interrupt" error message ... (but I get other ERRORs!). But more important: after "vbetool dpms on", why text screen was back there. @Chris: if vbetool would't generally not work with i915, when why did it work with the i915 with PCI id 8086:a011, or why did it work when the drm debug output changed the timing :-) BTW, my kernel doesn't have CONFIG_X86_LEGACY_VM86 set, so I'm unsure if/how it can access the video BIOS. But this is just a guess, I've not really looked into this.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>