Problem with live media and installation: unable to run free graphics on amd hd 5770

The problem:
Since a few updates and as well live-media, i could not boot into xfce manjaro stable any more (installed directly on hardware or using live-media). This problem was persistent for standard xfce live-media as well (at least I can state this for 17.1.5 and 17.1.6).

It seemed that it was not a kernel problem, no matter what kernel I used (I tested 4.9,4.14, and 4.15) I had the same problem. The only way i could boot into xfce desktop is using the catalyst driver and old xorg.

The behaviour of my pc:
grub (the bootloader) loaded well, i chose any of the manjaro entries and then it was like my computer fell into sleep before starting X. No messages, nothing. I even could not switch to a tty, keyboard was dead. The only thing I could do was cold-start my pc.

Cause: PCI express 2.0 seems to be working unstable for my graphics card (amd/ati radeon hd 5770) and mainboard (Foxconn A7DA 3) combination. This seemed to be not a problem for me until some things changed in xorg recently. According to the archlinux wiki this could happen for other ati graphics cards and mainboard combinations as well.

Solution:

  1. One solution is to reinstall using catalyst (proprietary graphics driver) which needs older xorg 1.7. However, then you are stuck with old software and an unsupported graphics driver.

  2. A better solution is the one provided by pixel27: Deactivate the version 2 mode of the pci express port by using the kernel parameter radeon.pcie_gen2=0 . The following instructions helped me to use the kernel parameter: https://wiki.archlinux.org/index.php/Kernel_parameters.

Reading https://wiki.archlinux.org/index.php/ATI they mention adding radeon.pcie_gen2=0 as a kernel parameter have you tried that?

1 Like

Thank you pixel27. :slight_smile:

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.

Forum kindly sponsored by