https://bugzilla.novell.com/show_bug.cgi?id=856653 https://bugzilla.novell.com/show_bug.cgi?id=856653#c0 Summary: Kernel crashes when using Fn+F[89] (brightness down/up) on FSC AMILO Xi 2550 Classification: openSUSE Product: openSUSE 12.3 Version: Final Platform: x86-64 OS/Version: openSUSE 12.3 Status: NEW Severity: Major Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: DOlsson@WEB.de QAContact: qa-bugs@suse.de Found By: --- Blocker: --- Created an attachment (id=572827) --> (http://bugzilla.novell.com/attachment.cgi?id=572827) Photo of kernel crash traceback. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0 Every time trying to in- or decrease the backlight brightness using the Fn+F[89] keys, the kernel (kernel-desktop-3.7.10-1.16.1.x86_64) crashes hard! The crash happens independently of whether I use the keys in a graphical or console display. My notebook is a FSC (Fujitsu Siemens Computer) AMILO Xi 2550/F44 with the graphic controller: $ /sbin/lspci | grep -i vga 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV630 [Mobility Radeon HD 2600 XT] $ /sbin/lspci -vvs 01:00.0 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV630 [Mobility Radeon HD 2600 XT] (prog-if 00 [VGA controller]) Subsystem: Fujitsu Technology Solutions Device 1107 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 48 Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M] Region 2: Memory at cfef0000 (64-bit, non-prefetchable) [size=64K] Region 4: I/O ports at 2000 [size=256] [virtual] Expansion ROM at cfe00000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: radeon Have tried with: 1) acpi_backlight=vendor 2) acpi_osi="!Windows 2012" but all in vain -- i.e. all results in the same kind of kernel crash. Interesting enough, when running my graphical KDE environment, the KDE window manager is capable of handling the backlight correctly, e.g. by dimming the backlight, when the screen has not been used for a while, just as it is capable of increasing the backlight, when hitting a key. Using the slider in the Battery Power Monitor also works without any problems. Using "sudo echo <number> >/sys/class/backlight/acpi_video0/brightness" also works most of the time. Most of the time, because the kernel may crash from time to time, if using this setting too fast! Reproducible: Always Steps to Reproduce: 1. Boot openSUSE 12.3 (fresh install with newest updates + KDE 4.11) on a FSC notebook model AMILO Xi 2550 with a ADM Mobility Radeon HD 2600 XT graphic controller. 2. Switch either to a text console or to the KDE graphic display and use key Fn+F8 (brightness down) or Fn+F9 (brightness up). 3. Observe the kernel crash with a "BUG: unable to handle kernel NULL pointer dereference at 0000000000000028". Actual Results: Kernel crashes with a BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 Expected Results: The backlight brightness should have been decreased. Attached is a photo of the kernel crash traceback. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.