On 02/07/2014 06:25 PM, Mika Westerberg wrote: > On Fri, Feb 07, 2014 at 09:29:58AM +0800, Aaron Lu wrote: >> On 02/03/2014 06:59 PM, Mika Westerberg wrote: >>> On HP EliteBook Revolve 810 the ACPI backlight device doesn't work as >>> expected. For example when resuming from system sleep, it seems to lose >>> backlight settings. >>> >>> Forcing Intel driver fixes the problem so add this machine the ACPI >>> video detect blacklist. >> >> For reference's purpose, can you please file a bug to kernel bugzilla >> under the ACPI/Power-Video category and attach the acpidump and dmesg >> there? Thanks. > > Done, the bug is here: > > https://bugzilla.kernel.org/show_bug.cgi?id=70231 > > I noticed that using only the acpi_video0 for tuning backlight works but if > I use intel_backlight directly, on resume I get values from acpi_video0 > instead. I'm not really familiar how this is supposed to work, though so > please let me know if I'm missing something. Thanks for the report, as communicated on the bug page, your system is already blacklisted for win8 by commit: commit 2d4054d8422462cb2771fdb4eb1925df55d2b320 Author: Takashi Iwai <tiwai@xxxxxxx> Fri Dec 20 00:09:12 2013 Committer: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Fri Dec 20 22:50:56 2013 ACPI: Blacklist Win8 OSI for some HP laptop 2013 models And the fact that acpi_video interface works made it not appropriate to add your system into the video_detect_dmi_table. You can just use acpi_video interface and everything should work fine. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
