[Discuss] display

[jdm at moylan.us (dan moylan)]

daniel gessel wrote:
> The tool "drm_info" will report details on available modes
> (and much more) if you have relatively modern graphics
> drivers. The package name has a hyphen instead of an
> underscore: "drm-info".

installed drm_info and got this:

Node: /dev/dri/card0
????Driver: simpledrm (DRM driver for simple-framebuffer platform devices) version 1.0.0 (20200625)
?   ????DRM_CLIENT_CAP_STEREO_3D supported
?   ????DRM_CLIENT_CAP_UNIVERSAL_PLANES supported
?   ????DRM_CLIENT_CAP_ATOMIC supported
?   ????DRM_CLIENT_CAP_ASPECT_RATIO supported
?   ????DRM_CLIENT_CAP_WRITEBACK_CONNECTORS supported
?   ????DRM_CAP_DUMB_BUFFER = 1
?   ????DRM_CAP_VBLANK_HIGH_CRTC = 1
?   ????DRM_CAP_DUMB_PREFERRED_DEPTH = 24
?   ????DRM_CAP_DUMB_PREFER_SHADOW = 0
?   ????DRM_CAP_PRIME = 3
?   ????DRM_CAP_TIMESTAMP_MONOTONIC = 1
?   ????DRM_CAP_ASYNC_PAGE_FLIP = 0
?   ????DRM_CAP_CURSOR_WIDTH = 64
?   ????DRM_CAP_CURSOR_HEIGHT = 64
?   ????DRM_CAP_ADDFB2_MODIFIERS = 1
?   ????DRM_CAP_PAGE_FLIP_TARGET = 0
?   ????DRM_CAP_CRTC_IN_VBLANK_EVENT = 1
?   ????DRM_CAP_SYNCOBJ = 0
?   ????DRM_CAP_SYNCOBJ_TIMELINE = 0
????Device: platform simple-framebuffer
?   ????Available nodes: primary
????Framebuffer size
?   ????Width: [1024, 4096]
?   ????Height: [768, 4096]
????Connectors
?   ????Connector 0
?       ????Object ID: 35
?       ????Type: unknown
?       ????Status: connected
?       ????Physical size: 270x203 mm
?       ????Subpixel: unknown
?       ????Encoders: {0}
?       ????Modes
?       ?   ????1024x768 at 60.00 preferred driver
?       ????Properties
?           ????"EDID" (immutable): blob = 0
?           ????"DPMS": enum {On, Standby, Suspend, Off} = On
?           ????"link-status": enum {Good, Bad} = Good
?           ????"non-desktop" (immutable): range [0, 1] = 0
?           ????"TILE" (immutable): blob = 0
?           ????"CRTC_ID" (atomic): object CRTC = 33
????Encoders
?   ????Encoder 0
?       ????Object ID: 34
?       ????Type: none
?       ????CRTCS: {0}
?       ????Clones: {0}
????CRTCs
?   ????CRTC 0
?       ????Object ID: 33
?       ????Legacy info
?       ?   ????Mode: 1024x768 at 60.00 preferred driver
?       ?   ????Gamma size: 0
?       ????Properties
?           ????"ACTIVE" (atomic): range [0, 1] = 1
?           ????"MODE_ID" (atomic): blob = 39
?           ?   ????1024x768 at 60.00 preferred driver
?           ????"OUT_FENCE_PTR" (atomic): range [0, UINT64_MAX] = 0
?           ????"VRR_ENABLED": range [0, 1] = 0
????Planes
    ????Plane 0
        ????Object ID: 31
        ????CRTCs: {0}
        ????Legacy info
        ?   ????FB ID: 38
        ?   ?   ????Object ID: 38
        ?   ?   ????Size: 1024x768
        ?   ?   ????Format: XRGB8888 (0x34325258)
        ?   ?   ????Modifier: DRM_FORMAT_MOD_LINEAR (0x0)
        ?   ?   ????Planes:
        ?   ?       ????Plane 0: offset = 0, pitch = 4096 bytes
        ?   ????Formats:
        ?       ????XRGB8888 (0x34325258)
        ????Properties
            ????"type" (immutable): enum {Overlay, Primary, Cursor} = Primary
            ????"FB_ID" (atomic): object framebuffer = 38
            ?   ????Object ID: 38
            ?   ????Size: 1024x768
            ?   ????Format: XRGB8888 (0x34325258)
            ?   ????Modifier: DRM_FORMAT_MOD_LINEAR (0x0)
            ?   ????Planes:
            ?       ????Plane 0: offset = 0, pitch = 4096 bytes
            ????"IN_FENCE_FD" (atomic): srange [-1, INT32_MAX] = -1
            ????"CRTC_ID" (atomic): object CRTC = 33
            ????"CRTC_X" (atomic): srange [INT32_MIN, INT32_MAX] = 0
            ????"CRTC_Y" (atomic): srange [INT32_MIN, INT32_MAX] = 0
            ????"CRTC_W" (atomic): range [0, INT32_MAX] = 1024
            ????"CRTC_H" (atomic): range [0, INT32_MAX] = 768
            ????"SRC_X" (atomic): range [0, UINT32_MAX] = 0
            ????"SRC_Y" (atomic): range [0, UINT32_MAX] = 0
            ????"SRC_W" (atomic): range [0, UINT32_MAX] = 1024
            ????"SRC_H" (atomic): range [0, UINT32_MAX] = 768
            ????"IN_FORMATS" (immutable): blob = 32
            ?   ????DRM_FORMAT_MOD_LINEAR (0x0)
            ?       ????XRGB8888 (0x34325258)
            ????"FB_DAMAGE_CLIPS" (atomic): blob = 41

don't know what to do.

tia,
ole dan

j. daniel moylan
84 harvard ave
brookline, ma 02446-6202
617-777-0207 (cel)
jdm at moylan.us
www.moylan.us
[BLM]