Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.16 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc7-utopic/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1349679 Title: Ubuntu 14.10 - No display with kernel 3.16 generic on HP dv6z 7000 (AMD APU + AMD GPU) Status in “linux” package in Ubuntu: Incomplete Bug description: After upgrading my laptop to the 14.10 alpha release, I no longer get any display after booting past GRUB. I select Ubuntu from the GRUB menu and then the display shuts completely off (including backlight) and remains off until I hard-reset the machine. It does appear to continue booting in the background but no combination of keys (ctrl+alt+f#, fn+f4 [monitor hotkey], ctrl+alt+backspace, etc) will wake the display. If I reboot back to my old 3.13 kernel from 14.04 it boots up properly with the display working fine. It did this with 3.15 as well, both from the kernel PPA and from the 14.10 alpha repository. I had a similar issue with kernel 3.12, in which I would see boot messages but the display would shut off when X started. This seems to be due to my configuration being not well supported. The laptop is a dual AMD system with an AMD A10-4600M APU and a discrete AMD Radeon HD 7730M 2GB GPU. I've determined that the display outputs (LVDS LCD, HDMI, and VGA) are off of the integrated APU graphics while the 7730M is only a render offload GPU. I cannot disable the discrete GPU in the very restrictive BIOS, thus both GPUs are available when booting the machine. I have configured VirtualBox on my Windows partition to be able to boot the physical partition so I can access it that way even if the kernel doesn't boot. I can also boot into recovery mode on the 3.15/3.16 kernels just fine, though the Radeon graphics do not work if I try to load X and it falls back to llvmpipe. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349679/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
