[Galaxy Note 4 Android Development (Snapdragon)] rob_z11:
Sometimes I catch them when I grep for mmc, and sometimes there is nothing..

Here is something from dmesg. Any thoughts?

[29171.269279] [0: mmcqd/0: 231] mmc0: Starting deferred resume

[29171.484327] I[0: swapper/0: 0] mmc0: data txfr (0x00100000) error: -110 after 163 ms

[29171.484361] I[0: swapper/0: 0] sdhci: =========== REGISTER DUMP (mmc0)===========

[29171.485228] I[0: swapper/0: 0] mmc0: clk: 400000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29171.485258] I[0: swapper/0: 0] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29171.485292] I[0: swapper/0: 0] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29171.499756] I[0: logd.klogd: 318] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[29171.499788] I[0: logd.klogd: 318] sdhci: =========== REGISTER DUMP (mmc0)===========

[29171.500615] I[0: logd.klogd: 318] mmc0: clk: 52000000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29171.500648] I[0: logd.klogd: 318] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29171.500684] I[0: logd.klogd: 318] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29171.501094] I[0: logd.klogd: 318] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[29171.501126] I[0: logd.klogd: 318] sdhci: =========== REGISTER DUMP (mmc0)===========

[29171.501944] I[0: logd.klogd: 318] mmc0: clk: 52000000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29171.501975] I[0: logd.klogd: 318] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29171.502010] I[0: logd.klogd: 318] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29171.505392] [0: mmcqd/0: 231] mmc0: failed to switch to 8-bit bus width

[29171.505594] [0: mmcqd/0: 231] mmc0: Deferred resume completed

[29174.601623] [0: mmcqd/0: 231] mmc0: Starting deferred resume

[29174.668466] I[0: ksoftirqd/0: 3] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[29174.668514] I[0: ksoftirqd/0: 3] sdhci: =========== REGISTER DUMP (mmc0)===========

[29174.669642] I[0: ksoftirqd/0: 3] mmc0: clk: 52000000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29174.669684] I[0: ksoftirqd/0: 3] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29174.669731] I[0: ksoftirqd/0: 3] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29174.670367] I[0: swapper/0: 0] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[29174.670408] I[0: swapper/0: 0] sdhci: =========== REGISTER DUMP (mmc0)===========

[29174.671545] I[0: swapper/0: 0] mmc0: clk: 52000000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29174.671592] I[0: swapper/0: 0] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29174.671644] I[0: swapper/0: 0] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29174.672435] [0: mmcqd/0: 231] mmc0: failed to switch to 8-bit bus width

[29174.672633] [0: mmcqd/0: 231] mmc0: Deferred resume completed

[29175.810113] [0: mmcqd/0: 231] mmc0: Starting deferred resume

[29175.880745] [0: mmcqd/0: 231] mmc0: Deferred resume completed

[29176.405313] [0: mmcqd/0: 231] mmc0: Starting deferred resume

[29176.485921] I[0: RenderThread: 1295] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[29176.485964] I[0: RenderThread: 1295] sdhci: =========== REGISTER DUMP (mmc0)===========

[29176.486928] I[0: RenderThread: 1295] mmc0: clk: 52000000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29176.486964] I[0: RenderThread: 1295] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29176.487004] I[0: RenderThread: 1295] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29176.489003] I[0: RenderThread: 1295] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[29176.489039] I[0: RenderThread: 1295] sdhci: =========== REGISTER DUMP (mmc0)===========

[29176.490054] I[0: RenderThread: 1295] mmc0: clk: 52000000 clk-gated: 0 claimer: mmcqd/0 pwr: 10

[29176.490095] I[0: RenderThread: 1295] mmc0: rpmstatus[pltfm](runtime-suspend:usage_count:disable_depth)(0:1:1)

[29176.490142] I[0: RenderThread: 1295] mmc0: card->cid : 150100523231384d41003f3b5778c100

[29176.490678] [2: mmcqd/0: 231] mmc0: failed to switch to 8-bit bus width

[29176.490843] [2: mmcqd/0: 231] mmc0: Deferred resume completed