From: Egbert Eich Date: Tue, 18 Jul 2017 17:20:53 +0200 Subject: drm/radeon: Set depth on low mem to 16 bpp instead of 8 bpp MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Git-commit: 7b8bd6bb4298ac7c9aeb7ecab9e4864da3272b64 Patch-mainline: v4.14-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 The radeon driver reduces the framebuffer resolution to 8bpp if a device with less than 32MB VRAM is found. This causes the framebuffer to run in 8 bit paletted mode. For a text console this is not an issue as 256 different colors is more than one gets on a VGA text console. However this leads to a poor 8bit pseudo-color visual when running X on fbdev, too, which is quite ugly. In this patch, we try to give some moderate compromise: limit the framebuffer bpp to 8 only when VRAM is 8MB or less, and use 16 bpp otherwise for 32MB or less VRAM. Reviewed-by: Michel Dänzer Signed-off-by: Egbert Eich Signed-off-by: Takashi Iwai Signed-off-by: Alex Deucher Acked-by: Petr Tesarik --- drivers/gpu/drm/radeon/radeon_fb.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/radeon/radeon_fb.c +++ b/drivers/gpu/drm/radeon/radeon_fb.c @@ -344,9 +344,12 @@ int radeon_fbdev_init(struct radeon_devi if (list_empty(&rdev->ddev->mode_config.connector_list)) return 0; - /* select 8 bpp console on RN50 or 16MB cards */ - if (ASIC_IS_RN50(rdev) || rdev->mc.real_vram_size <= (32*1024*1024)) + /* select 8 bpp console on 8MB cards, or 16 bpp on RN50 or 32MB */ + if (rdev->mc.real_vram_size <= (8*1024*1024)) bpp_sel = 8; + else if (ASIC_IS_RN50(rdev) || + rdev->mc.real_vram_size <= (32*1024*1024)) + bpp_sel = 16; rfbdev = kzalloc(sizeof(struct radeon_fbdev), GFP_KERNEL); if (!rfbdev)