When using the fbdev driver for Xorg, the function fbdev_open_pci() in hw/xfree86/fbdevhw/fbdevhw.c is being called. That function is meant to scat pci devices until it finds a framebuffer and attempts to open the corresponding /dev/fb* device file. The function fails to detect my efi framebuffer. Because of this, Xorg fails to start when using the fbdev driver. This patch fixes this: --- a/hw/xfree86/fbdevhw/fbdevhw.c 2024-12-18 23:36:48.507345534 +0200 +++ b/hw/xfree86/fbdevhw/fbdevhw.c 2024-12-18 23:41:37.472499039 +0200 @@ -278,6 +278,13 @@ pPci->domain, pPci->bus, pPci->dev, pPci->func, i); fd = open(filename, O_RDONLY, 0); } + /* efi framebuffer is under a different name */ + if (fd < 0) { + snprintf(filename, sizeof(filename), + "/sys/bus/pci/devices/%04x:%02x:%02x.%d/efi-framebuffer.%d", + pPci->domain, pPci->bus, pPci->dev, pPci->func, i); + fd = open(filename, O_RDONLY, 0); + } if (fd >= 0) { close(fd); snprintf(filename, sizeof(filename), "/dev/fb%d", i);
See: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1776
Took a closer look at the xserver repo. A fix for this is already in the code. I know that the Xorg server in gentoo is quite a bit older that the latest xserver release. Is there any chance for this patch to be added to the Xorg ebuild? This is the patch: https://gitlab.freedesktop.org/xorg/xserver/-/commit/728b54528d37ffa27b07c9b181c5ed8d2d359379
(In reply to stefan11111 from comment #2) > Took a closer look at the xserver repo. > A fix for this is already in the code. > > I know that the Xorg server in gentoo is quite a bit older that the latest > xserver release. Is there any chance for this patch to be added to the Xorg > ebuild? > > This is the patch: > https://gitlab.freedesktop.org/xorg/xserver/-/commit/ > 728b54528d37ffa27b07c9b181c5ed8d2d359379 This patch was backported to 21.1.x and in now in ::gentoo This fixes this bug.
